The present invention belongs to the electric power technical field and relates to a transformer temperature indication controller temperature sensing bulb rainproof apparatus. The apparatus comprises a base, a supporting tube and a rainproof cover; a mounting hole which is matched with the outer diameter of the supporting tube is formed at the middle of the base; the interior of the supporting tube is hollow; an opening is formed at the lower end of the supporting tube; the lower end of the supporting tube is welded in the mounting hole in a matched manner, after the supporting tube is mounted, the lower edge of the supporting tube is flushed with the lower edge of the base; a working hole from which a corrugated tube and a capillary can extent out is formed at the upper end of the supporting tube; the rainproof cover completely covers the working hole at the upper end of the supporting tube; the rainproof cover is movably connected with the upper end of the supporting tube through a hinge; a positioning groove hole with an opening formed at the lower end is formed at one side surface of the rainproof cover; a positioning circular hole matched with the positioning groove hole is formed at the upper end of the supporting tube; a positioning circular hole dovetail screw passes through the positioning circular hole, so that the rainproof cover can be in positioned connection with and the supporting tube; at least two fixing screw holes are formed in the tube body of the supporting tube; and fixing screws are arranged in the fixing screw holes.